Cantankerous, quarrelsome (12)
I believe the answer is:
disagreeable
This clue is a double definition.
'cantankerous' is the first definition.
(thesaurus)
'quarrelsome' is the second definition.
(thesaurus)
(Other definitions for disagreeable that I've seen before include "Bad-tempered" , "Unpleasant" , "Offensive - peevish" , "Obnoxious" .)